Rack shelf



FIG. 1 is a top perspective view of a rack shelf;

FIG. 2 is a top plan view of rack shelf of FIG. 1;

FIG. 3 is a bottom plan view of the rack shelf of FIG. 1;

FIG. 4 is a front elevational view of the rack shelf of FIG. 1;

FIG. 5 is a rear elevational view of the rack shelf of FIG. 1;

FIG. 6 is an elevational view of a first side rack shelf of FIG. 1; and,

FIG. 7 is an elevational view of a second side of the rack shelf of FIG. 1. 

CLAIM The ornamental design for a rack shelf, as shown and described. 